Table 2 Total concentration and different fraction content of Cd, Pb, Cr, Zn, Hg and As in the soil sample (Mean ± SE, mg·kg−1).

From: Chelating capture and magnetic removal of non-magnetic heavy metal substances from soil

Heavy metal concentration Cd Pb As Cr Zn Hg
Before treatment After treatment Before treatment After treatment
Water-soluble fraction 0.012 ± 0.01 ~0 0.058 ± 0.01 ~0 0.292 ± 0.029 0.060 ± 0.08 0.736 ± 0.75 0.018 ± 0.006
Interchangeable fraction 2.758 ± 0.22 0.071 ± 0.013 0.363 ± 0.048 0.964 ± 0.097 2.846 ± 0.31 6.816 ± 1.38
Carbonate-bound fraction 3.381 ± 0.30 33.39 ± 3.01 0.309 ± 0.028 1.723 ± 0.20 73.83 ± 6.89 0.119 ± 0.02
Iron-manganese oxide-bound fraction 3.094 ± 0.34 67.92 ± 7.59 0.451 ± 0.056 4.512 ± 0.77 378.3 ± 43.1 0.202 ± 0.04
Organic-bound fraction 0.738 ± 0.067 1.639 9.435 ± 1.02 52.70 3.306 ± 0.45 18.68 ± 2.06 90.45 ± 9.9 10.23 ± 1.67
Residual fraction 0.917 ± 0.11 79.12 ± 8.96 47.33 ± 5.51 169.0 ± 18.80 164.9 ± 22.4 1.312 ± 0.19
Total content 10.91 ± 2.06   190.0 ± 33.2   50.75 ± 4.72 194.9 ± 49.9 660.9 ± 99.0 18.66 ± 2.75